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Open AccessArticle

On the Robustness of the MnSi Magnetic Structure Determined by Muon Spin Rotation

Institut Nanosciences et Cyrogénie, University Grenoble Alpes, CEA, Pheliqs, 38000 Grenoble, France
Laboratory for Muon-Spin Spectroscopy, Paul Scherrer Institute, 5232 Villigen-PSI, Switzerland
Department of Physics, Tbilisi State University, Chavchavadze 3, 0128 Tbilisi, Georgia
Faculty of Physics, Babes-Bolyai University, 400084 Cluj-Napoca, Romania
Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institute, 5232 Villigen-PSI, Switzerland
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Quantum Beam Sci. 2018, 2(3), 19;
Received: 29 June 2018 / Revised: 31 August 2018 / Accepted: 13 September 2018 / Published: 19 September 2018
(This article belongs to the Special Issue Magnetic Materials and Magnetism)
Muon spin rotation ( μ SR) spectra recorded for manganese silicide MnSi and interpreted in terms of a quantitative analysis constrained by symmetry arguments were recently published. The magnetic structures of MnSi in zero-field at low temperature and in the conical phase near the magnetic phase transition were shown to substantially deviate from the expected helical and conical structures. Here, we present material backing the previous results obtained in zero-field. First, from simulations of the field distributions experienced by the muons as a function of relevant parameters, we confirm the uniqueness of the initial interpretation and illustrate the remarkable complementarity of neutron scattering and μ SR for the MnSi magnetic structure determination. Second, we present the result of a μ SR experiment performed on MnSi crystallites grown in a Zn-flux and compare it with the previous data recorded with a crystal obtained from Czochralski pulling. We find the magnetic structure for the two types of crystals to be identical within experimental uncertainties. We finally address the question of a possible muon-induced effect by presenting transverse field μ SR spectra recorded in a wide range of temperature and field intensity. The field distribution parameters perfectly scale with the macroscopic magnetization, ruling out a muon-induced effect. View Full-Text
Keywords: manganese silicide; chiral magnetism; helimagnet; conical magnetic phase; muon spin rotation manganese silicide; chiral magnetism; helimagnet; conical magnetic phase; muon spin rotation
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Dalmas de Réotier, P.; Yaouanc, A.; Amato, A.; Maisuradze, A.; Andreica, D.; Roessli, B.; Goko, T.; Scheuermann, R.; Lapertot, G. On the Robustness of the MnSi Magnetic Structure Determined by Muon Spin Rotation. Quantum Beam Sci. 2018, 2, 19.

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